【作者】 樊靖郁； 张燕； 王道增；

【Author】 Fan Jing-yu Zhang Yan Wwng Dao-zeng (Shanghai University,Shanghai Institute of Applied Mathematics and Mechanics, Shanghai 200072, P R China)

【机构】 上海大学上海市应用数学和力学研究所；

【摘要】 本文采用RNG湍流模型对浅水环境中含污染物横向射流近区的三维流场和浓度场进行了详细的数值计算,并与相应的实验结果进行了比较。数值计算结果表明在近区冲击区内射流冲击底壁后形成的壁射流与环境横流的相互作用具有强烈的三维性,在滞止点上游存在一高浓度聚集区,其纵向和横向范围受到环境水深和流速比的影响。滞止点下游壁射流区的浓度衰减随环境水深的增大而增大,随流速比的增大而减小。当流速比相对较小时。过渡区内在靠近对称面以及底层壁射流与环境横流的横向边界附近出现横向高浓度聚集区,其横向位置和范围随下游距离的增加逐渐沿横向扩展。更多还原

【Abstract】 The three-dimensional flow and concentration fields of a pollutant-contained transverse jet in shallow waters in near field are numerically investigated in detail using RNG turbulence model and comparing with corresponding experimental results. The numerical results indicate that the interaction between the wall jet formed by the jet impinging upon the bottom wall and the ambient crossflow in the impinging region shows intense three-dimensionality. There exists a high concentration convergence in upstream zone relative to the stagnation point, and its longitudinal and lateral ranges vary with the water depths and velocity ratios. The concentration decays of downstream wall jet zone will increase with the increasing water depths and decreasing velocity ratios. When the velocity ratio is relatively small, there exist lateral high concentration convergence zones near the symmetry plane and in the vicinity of the lateral edge between the bottom layer wall jet and the ambient crossflow in the transition region, and corresponding lateral positions and ranges will spread laterally with the increasing downstream distance.更多还原